Re: [PATCH 00/10] Add the Git Change command

> On Tue, Oct 4, 2022 at 5:19 PM Chris P <christophe.poucet@gmail.com> wrote:
>>
>> Thanks a lot.
>>
>> Is there something special I must do to get these scripts to work? The
>> entire script fails for me, despite having build git-change.
>>
>> On Tue, Oct 4, 2022 at 4:24 PM Phillip Wood <phillip.wood123@gmail.com> wrote:
>>>
>>> Hi Chris
>>>
>>> On 23/09/2022 19:55, Christophe Poucet via GitGitGadget wrote:
>>>> I'm reviving the original git evolve work that was started by
>>>> sxenos@google.com
>>>> (https://public-inbox.org/git/20190215043105.163688-1-sxenos@google.com/)
>>>>
>>>> This work is intended to make it easier to deal with stacked changes.
>>>>
>>>> The following set of patches introduces the design doc on the evolve command
>>>> as well as the basics of the git change command.
>>>
>>> Our test suite can be a little tricky to get started with and I was impatient to
>>> check the basic functionality of these patches so I've written some simple
>>> example tests for the change command and a couple of fixups to make them pass.
>>>
>>> Best Wishes
>>>
>>> Phillip
>>>
>>> ---- >8 ----
>>>
>>>   From a7c38d0f388e4d8a1f3debcc3069a7fb43084eda Mon Sep 17 00:00:00 2001
>>> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>>> Date: Tue, 4 Oct 2022 15:12:36 +0100
>>> Subject: [PATCH 1/3] fixup! evolve: add support for writing metacommits
>>>
>>> ---
>>>    metacommit.c | 2 +-
>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/metacommit.c b/metacommit.c
>>> index d2b859a4d3..8f970fa104 100644
>>> --- a/metacommit.c
>>> +++ b/metacommit.c
>>> @@ -296,7 +296,7 @@ int record_metacommit_withresult(
>>>           if (override_change) {
>>>                   string_list_clear(changes, 0);
>>>                   overridden_head = get_change_head(chtable, override_change);
>>> -               if (!overridden_head) {
>>> +               if (overridden_head) {
>>>                           /* This is an existing change */
>>>                           old_head = &overridden_head->head;
>>>                           if (!force) {
>>> --
>>> 2.37.3.947.g1b8ba4da7f.dirty
>>>
>>>
>>>   From cc7e8ba0b1a90268ced85d3f0c91aed49f2246d6 Mon Sep 17 00:00:00 2001
>>> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>>> Date: Tue, 4 Oct 2022 15:15:32 +0100
>>> Subject: [PATCH 2/3] fixup! evolve: implement the git change command
>>>
>>> ---
>>>    t/t9999-changes.sh | 126 +++++++++++++++++++++++++++++++++++++++++++++
>>>    1 file changed, 126 insertions(+)
>>>    create mode 100755 t/t9999-changes.sh
>>>
>>> diff --git a/t/t9999-changes.sh b/t/t9999-changes.sh
>>> new file mode 100755
>>> index 0000000000..9e58925b23
>>> --- /dev/null
>>> +++ b/t/t9999-changes.sh
>>> @@ -0,0 +1,126 @@
>>> +#!/bin/sh
>>> +
>>> +test_description='git change - low level meta-commit management'
>>> +
>>> +. ./test-lib.sh
>>> +
>>> +. "$TEST_DIRECTORY"/lib-rebase.sh
>>> +
>>> +test_expect_success 'setup commits and meta-commits' '
>>> +       for c in one two three
>>> +       do
>>> +               test_commit $c &&
>>> +               git change update --content $c >actual 2>err &&
>>> +               echo "Created change metas/$c" >expect &&
>>> +               test_cmp expect actual &&
>>> +               test_must_be_empty err &&
>>> +               test_cmp_rev refs/metas/$c $c || return 1
>>> +       done
>>> +'
>>> +
>>> +# Check a meta-commit has the correct parents Call with the object
>>> +# name of the meta-commit followed by pairs of type and parent
>>> +check_meta_commit () {
>>> +       name=$1
>>> +       shift
>>> +       while test $# -gt 0
>>> +       do
>>> +               printf '%s %s\n' $1 $(git rev-parse --verify $2)
>>> +               shift
>>> +               shift
>>> +       done | sort >expect
>>> +       git cat-file commit $name >metacommit &&
>>> +       # commit body should consist of parent-type
>>> +           types="$(sed -n '/^$/ {
>>> +                       :loop
>>> +                       n
>>> +                       s/^parent-type //
>>> +                       p
>>> +                       b loop
>>> +                   }' metacommit)" &&
>>> +       while read key value
>>> +       do
>>> +               # TODO: don't sort the first parent
>>> +               if test "$key" = "parent"
>>> +               then
>>> +                       type="${types%% *}"
>>> +                       test -n "$type" || return 1
>>> +                       printf '%s %s\n' $type $value
>>> +                       types="${types#?}"
>>> +                       types="${types# }"
>>> +               elif test "$key" = "tree"
>>> +               then
>>> +                       test_cmp_rev "$value" $EMPTY_TREE || return 1
>>> +               elif test -z "$key"
>>> +               then
>>> +                       # only parse commit headers
>>> +                       break
>>> +               fi
>>> +       done <metacommit >actual-unsorted &&
>>> +       test -z "$types" &&
>>> +       sort >actual <actual-unsorted &&
>>> +       test_cmp expect actual
>>> +}
>>> +
>>> +test_expect_success 'update meta-commits after rebase' '
>>> +       (
>>> +               set_fake_editor &&
>>> +               FAKE_AMEND=edited &&
>>> +               FAKE_LINES="reword 1 pick 2 fixup 3" &&
>>> +               export FAKE_AMEND FAKE_LINES &&
>>> +               git rebase -i --root
>>> +       ) &&
>>> +
>>> +       # update meta-commits
>>> +       git change update --replace tags/one --content HEAD~1 >out 2>err &&
>>> +       echo "Updated change metas/one" >expect &&
>>> +       test_cmp expect out &&
>>> +       test_must_be_empty err &&
>>> +       git change update --replace tags/two --content HEAD@{2} &&
>>> +       oid=$(git rev-parse --verify metas/two) &&
>>> +       git change update --replace HEAD@{2} --replace tags/three \
>>> +               --content HEAD &&
>>> +
>>> +       # check meta-commits
>>> +       check_meta_commit metas/one c HEAD~1 r tags/one &&
>>> +       check_meta_commit $oid c HEAD@{2} r tags/two &&
>>> +       # NB this checks that "git change update" uses the meta-commit ($oid)
>>> +       #    corresponding to the replaces commit (HEAD@2 above) given on the
>>> +       #    commandline.
>>> +       check_meta_commit metas/two c HEAD r $oid r tags/three &&
>>> +       check_meta_commit metas/three c HEAD r $oid r tags/three
>>> +'
>>> +
>>> +reset_meta_commits () {
>>> +    for c in one two three
>>> +    do
>>> +       echo "update refs/metas/$c refs/tags/$c^0"
>>> +    done | git update-ref --stdin
>>> +}
>>> +
>>> +test_expect_success 'override change name' '
>>> +       # TODO: builtin/change.c expects --change to be the full refname,
>>> +       #       ideally it would prepend refs/metas to the string given by the
>>> +       #       user.
>>> +       git change update --change refs/metas/another-one --content one &&
>>> +       test_cmp_rev metas/another-one one
>>> +'
>>> +
>>> +test_expect_success 'non-fast forward meta-commit update refused' '
>>> +       test_must_fail git change update --change refs/metas/one --content two \
>>> +               >out 2>err &&
>>> +       echo "error: non-fast-forward update to ${SQ}refs/metas/one${SQ}" \
>>> +               >expect &&
>>> +       test_cmp expect err &&
>>> +       test_must_be_empty out
>>> +'
>>> +
>>> +test_expect_success 'forced non-fast forward update succeeds' '
>>> +       git change update --change refs/metas/one --content two --force \
>>> +               >out 2>err &&
>>> +       echo "Updated change metas/one" >expect &&
>>> +       test_cmp expect out &&
>>> +       test_must_be_empty err
>>> +'
>>> +
>>> +test_done
>>> --
>>> 2.37.3.947.g1b8ba4da7f.dirty
>>>
>>>
>>>   From 7784f253fa799dd11fcbc81fe815fb387af52d97 Mon Sep 17 00:00:00 2001
>>> From: Phillip Wood <phillip.wood@dunelm.org.uk>
>>> Date: Tue, 4 Oct 2022 15:16:05 +0100
>>> Subject: [PATCH 3/3] fixup! evolve: add the git change list command
>>>
>>> ---
>>>    builtin/change.c   | 16 +++++-----------
>>>    t/t9999-changes.sh | 11 +++++++++++
>>>    2 files changed, 16 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/builtin/change.c b/builtin/change.c
>>> index 07d029d82d..888ef648fa 100644
>>> --- a/builtin/change.c
>>> +++ b/builtin/change.c
>>> @@ -34,9 +34,8 @@ static int change_list(int argc, const char **argv, const char* prefix)
>>>                   OPT_END()
>>>           };
>>>           struct ref_filter filter;
>>> -       /* TODO: See below
>>>           struct ref_sorting *sorting;
>>> -       struct string_list sorting_options = STRING_LIST_INIT_DUP; */
>>> +       struct string_list sorting_options = STRING_LIST_INIT_DUP;
>>>           struct ref_format format = REF_FORMAT_INIT;
>>>           struct ref_array array;
>>>           int i;
>>> @@ -53,19 +52,15 @@ static int change_list(int argc, const char **argv, const char* prefix)
>>>
>>>           filter_refs(&array, &filter, FILTER_REFS_CHANGES);
>>>
>>> -       /* TODO: This causes a crash. It sets one of the atom_value handlers to
>>> -        * something invalid, which causes a crash later when we call
>>> -        * show_ref_array_item. Figure out why this happens and put back the sorting.
>>> -        *
>>> -        * sorting = ref_sorting_options(&sorting_options);
>>> -        * ref_array_sort(sorting, &array); */
>>> -
>>>           if (!format.format)
>>>                   format.format = "%(refname:lstrip=1)";
>>>
>>>           if (verify_ref_format(&format))
>>>                   die(_("unable to parse format string"));
>>>
>>> +       sorting = ref_sorting_options(&sorting_options);
>>> +       ref_array_sort(sorting, &array);
>>> +
>>>           for (i = 0; i < array.nr; i++) {
>>>                   struct strbuf output = STRBUF_INIT;
>>>                   struct strbuf err = STRBUF_INIT;
>>> @@ -79,8 +74,7 @@ static int change_list(int argc, const char **argv, const char* prefix)
>>>           }
>>>
>>>           ref_array_clear(&array);
>>> -       /* TODO: see above
>>> -       ref_sorting_release(sorting); */
>>> +       ref_sorting_release(sorting);
>>>
>>>           return 0;
>>>    }
>>> diff --git a/t/t9999-changes.sh b/t/t9999-changes.sh
>>> index 9e58925b23..9312eba86d 100755
>>> --- a/t/t9999-changes.sh
>>> +++ b/t/t9999-changes.sh
>>> @@ -123,4 +123,15 @@ test_expect_success 'forced non-fast forward update succeeds' '
>>>           test_must_be_empty err
>>>    '
>>>
>>> +test_expect_success 'list changes' '
>>> +       cat >expect <<-\EOF &&
>>> +       metas/another-one
>>> +       metas/one
>>> +       metas/three
>>> +       metas/two
>>> +       EOF
>>> +       git change list >actual &&
>>> +       test_cmp expect actual
>>> +'
>>> +
>>>    test_done
>>> --
>>> 2.37.3.947.g1b8ba4da7f.dirty